(help) Problem in LHG 4G KIT connection

It’s a weird experience for my LHG kit.

My main problem is, in a certain network provider, even the signal reception is good like the RSSI, RSRP, SINR and RSRQ are all excellent, the internet is not that good. Until a certain time, it drops to 0mbps. Secondly, if i use speedtest my ookla, errors occurs followed by the resetting of the lte configuration resulting to connection rebooting. Very weird. Did someone experience this too?